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Can SingNet Anti-spam VAS filter out all the spam emails I receive?

As there is no absolute definition of what is considered spam, SingNet's Anti-spam service may not be able to filter off 100% of all spam mails, but it should be able to filter out the most common forms of it.

Can SingNet Anti-spam VAS filter out spam from my other non-singnet emails eg Hotmail or Yahoo?

That is not possible. SingNet Anti-spam VAS can only filter out mails from your SingNet email account.